/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package com.pinterest.secor.main;

import com.pinterest.secor.common.monitoring.OstrichAdminService;
import com.pinterest.secor.common.SecorConfig;
import com.pinterest.secor.common.ShutdownHookRegistry;
import com.pinterest.secor.consumer.Consumer;
import com.pinterest.secor.io.StagingDirectoryCleaner;
import com.pinterest.secor.monitoring.MetricCollector;
import com.pinterest.secor.tools.LogFileDeleter;
import com.pinterest.secor.util.FileUtil;
import com.pinterest.secor.util.IdUtil;
import com.pinterest.secor.util.RateLimitUtil;
import com.pinterest.secor.util.ReflectionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.LinkedList;

/**
 * Secor consumer.  See
 * https://docs.google.com/a/pinterest.com/document/d/1RHeH79O0e1WzsxumE24MIYqJFnRoRzQ3c74Wq3Q4R40/edit
 * for detailed design.
 *
 * Run:
 *     $ cd optimus/secor
 *     $ mvn package
 *     $ cd target
 *     $ java -ea -Dlog4j.configuration=log4j.dev.properties -Dconfig=secor.dev.backup.properties \
 *         -cp "secor-0.1-SNAPSHOT.jar:lib/*" com.pinterest.secor.main.ConsumerMain
 *
 * @author Pawel Garbacki (pawel@pinterest.com)
 */
public class ConsumerMain {
    private static final Logger LOG = LoggerFactory.getLogger(ConsumerMain.class);

    public static void main(String[] args) {
        if (args.length != 0) {
            System.err.println("Usage: java -Dconfig=<secor_properties> " +
                               "-Dlog4j.configuration=<log4j_properties> ConsumerMain");
            return;
        }
        try {
            SecorConfig config = SecorConfig.load();
            String stagingDirectoryPath = config.getLocalPath() + '/' + IdUtil.getLocalMessageDir();
            ShutdownHookRegistry.registerHook(10, new StagingDirectoryCleaner(stagingDirectoryPath));

            MetricCollector metricCollector = ReflectionUtil.createMetricCollector(config.getMetricsCollectorClass());
            metricCollector.initialize(config);

            OstrichAdminService ostrichService = new OstrichAdminService(config);
            ostrichService.start();
            FileUtil.configure(config);

            LogFileDeleter logFileDeleter = new LogFileDeleter(config);
            logFileDeleter.deleteOldLogs();

            RateLimitUtil.configure(config);
            LOG.info("starting {} consumer threads", config.getConsumerThreads());
            LinkedList<Consumer> consumers = new LinkedList<Consumer>();
            for (int i = 0; i < config.getConsumerThreads(); ++i) {
                Consumer consumer = new Consumer(config, metricCollector);
                consumers.add(consumer);
                consumer.start();
            }
            for (Consumer consumer : consumers) {
                consumer.join();
            }
        } catch (Throwable t) {
            LOG.error("Consumer failed", t);
            System.exit(1);
        }
    }
}
